Mazzucchelli actually penciled that issue, but it wasn't inked by him, so it looked a bit different. I have trouble believing that the Art Adams cover was for Classic X-men 3 because the style on that cover is more like the cartoony style he developed later in his career. When he did those early Classic X-Men covers he was still using his hyper detailed style. Could it be for a reprint book of Classic X-Men or something similar?

And after a good search, you are correct about that Classic X-Men cover. Good eye at spotting that. Sorry to mislead folks, it wasn't my intention. Looks like it was created in 2000 for a Thunderbird special that never happened and then included in the Modern Masters Art Adams issue.

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